High thin clouds are very transparent to solar radiation, like clear air.

太阳辐射可以轻易地通过高空薄云层，就像通过空气一样。

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Cosmic rays of various kinds come through the air from outer space, but enormous quantities of radiation from the sun are screened off.

来自外太空的各种宇宙射线通过空气进入大气层，但来自太阳的大量辐射却被屏蔽了。

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Will the radiation spread across the globe via air or sea?

辐射会通过空气或者海洋扩散到全世界吗？

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"I think we have a really solid history of doing the rules in a way that makes sense, " said Ms. McCarthy, the agency's assistant administrator for air and radiation.

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That could have led to a loss of water and eventually to the exposure of the spent fuel rods to air, releasing radiation.

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But perhaps for radon concentration in the air, a radiation level of 5 to 10 picocuries per liter is about right for maximum benefit, speculates Myron Pollycove, a professor emeritus of laboratory medicine and radiology at the University of California, San Francisco.

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